Sensitivity variations of Listeria strains to the bacteriocins lactocin 705, enterocin CRL35 and nisin

CASTELLANO PATRICIA, FARÍAS MARIA EUGENIA, HOLZAPFEL WILHEM AND VIGNOLO GRACIELA

BIOTECHNOLOGY LETTERS

Kluwer Academic Publishers

Lugar: The Netherlands; Año: 2001 vol. 23 p. 605 - 608

0141-5492

Abstract Five strains of Listeria monocytogenes, four strains of Listeria innocua and a strain of Listeria seeligeri showed different sensitivities to lactocin 705 (17000 AU/ml), enterocin CRL35 (8500 AU/ml) and nisin (2500 IU/ml) at different pHs (5, 6 and 7). Even the decrease growth at pH 5, the effect of bacteriocins was strain dependent. L. monocytogenes had enhanced nisin tolerance while the non-nisin bacteriocins were more inhibitory with viability loss values of 3.0 - 3.4 in contrast with 1.5 - 1.8 log cycles respectively. Lower viability loss values were obtained with L. innocua strains with all three bacteriocins while L. seeligeri was more sensitive to nisin than to lactocin 705 or enterocin CRL35.